Stirrer



y 1951 1. J. HAWTOF 2,562,714

STIRRER Filed June 9, 1949 JNVENT 1324a I l/nw fia'ten ted juiy 31, 195i UNITED STIRRER I Israel J. 'Hawtof, Brooklyn, .N. Y., assignor to Ivan Sorvall, Inc., New York, N. Y., a corporation Application June -9, 1949, Serial No. 97,991

This invention relates to a new article .of

manufacture consisting of a rod or barypreferably of magnetic material, sealed within aglass envelope with means to preventbreakingof the envelope when in use. Such a rod may be used as the element driven by a rotating or traveling magnet as, for example, a stirrer. In such .device the encased bar can be used without danger of contaminating the solutions within which it may be placed, and without the likelihood of producing undesired chemical reactions with the solution. Additionally, the article, according to my invention, may be used as part of an advertising or other novelty, or a plurality thereof may become a toy. Y

It is an object of this-inventicn-to provide such a rod or magnet enclosed ingglass, :which may be quickly, easily and inexpensively assembled from glass tubing. r

It is another'object of the invention a construction of enclosure which-when operating "as a stirrer, will roll easily on the bottom of the container with a minimum of friction, thereby permitting the use of a smaller and less expensive motor drive, and reducing the likelihood of scoring or scratching the container.

It is another object of this invention to provide a construction in which padding is interposed between the rod and the glass envelope to reduce the danger of breakage.

It is a further object of this invention to provide a construction in which a further protection, as a strip of fabric, or the like, containing the manufacturers name and other information, may be sealed within the container.

Still other objects and advantages of my invention will be apparent from the specification. The features of novelty which I believe to be characteristic of my invention are set forth with particularity in the appended claims. My invention itself, however, both as to its fundamental principles and as to its particular embodiments, will best'be understood by reference to the specification and accompanying drawing, in which- Figure 1 is a longitudinal section, on lines ll of Figure 2, showing an embodiment of this invention.

Figure 2 is a transverse section on lines 2-2 of Figure 1.

Referring more particularly to the drawings, I is a rod or bar, in this instance, of magnetic material, and preferably a permanent magnet made of Alnico metal. The length of the bar is generally somewhat larger as compared to its diameter. If desired, the rod l0, may be sur- 7Claims. (01159-144) rounded, partially or completely, both circumferentially and longitudinally, with a fabric strip ll, preferably of asbestos cloth, upon which the name of the manufacturer and otherinformation may be suitably printed or otherwise inscribed. At the ends of the rod Ill are small pads l2 and I3, respectively, which may be made of asbestos fiber or cloth. The assembly of rod ll), .fabric II, and pads l2 and I3 is sealed within-a glass envelope M, which is desirably provided with flanges or the like which project outwardly from the body of the tubing [4, as indicated at [5 and 16. Such flanges permit the article to roll with less friction than would be present if they were omitted, and while I prefer to form the flanges at or adjacent the ends, they may be formed at intermediate points if desired, and be differently shaped.

In making the article, suflicient clearance is left between the envelope or tube l4 and the rod Into-permit the rod Ill, with thefabric covering ll .if employed, to be easily inserted within the envelope Id. The amount of clearance provided,

, both diametrically and longitudinally, is not critical, and is made sufficient to permit ready insertion of the rod, either with or without the fabric covering II. A greater clearance is generally undesirable since it would permit excessive motion of the rod I0 within the envelope, which might result in cracking the envelope.

I prefer to use Pyrex tubing for the envelope and to form the flanges by heating the ends of the tube until soft, then pressing the softened ends against a suitable flat surface. The open ends of the tube are sealed by applying a rod of similar glass which is fused to the ends of the tubing 14. By melting the glass rod adjacent the point of junction with the tubing M, the rod may be pulled away, and the ends again pressed against a flatv surface while still soft, as indicated in Figure 1. While for certain purposes I prefer to use Pyrex glass and asbestos fabric II, and asbestos pads 12 and I3, if a lower melting glass is employed, the pads may be of any other suitable material which will not char or be damaged by the heat necessary to seal the tube.

In assembling this article, in the illustrated embodiment, the ends of the tube or envelope may be flanged as described and one end of the tube completely sealed. Thereupon one of the pads 12 and I3 is tamped in place against the sealed end, the covering II and rod 10 inserted, followed by the other end pad, and the open end sealed to complete the enclosure.

- provided a device which While I may employ the fabric II, this is not necessary and it may be omitted, with or without reducing the diameter of the tube. Or this fabric may be replaced by a packing, as of the fibers similar to pads I2 and 13. Similarly, the pads l2 and 13 may be replaced by other, and more resilient material.

From the foregoing it will be seen that I have is exceedingly economical to manufacture, which is chemically acceptable in stirring equipment, and which is adequately protected against breakage in use.

In the specification, I have explained the principles of my invention and the best mode in which I have contemplated applying those principles, so as to distinguish my invention from other inventions; and I have particularly pointed out and distinctly claimed that part, improvement or combination which I claim as my invention or discovery.

While I have shown and described certain preferred embodiments of my invention, it will be longitudinally, a layer of understood that modifications and changes may be made without departing from the spirit and scope thereof, as will be clear to those skilled in the art.

I claim: 1. A new article of manufacture consisting of a permanent magnet in the form of a rod and a glass envelope enclosing said rod and having clearance therefrom, and shock absorbing pads within said envelope at the ends of said rod.

2. A new article of manufacture consisting of a permanent magnet in the form of a rod, 9. glass envelope enclosing said rod and having clearance therefrom, said envelope also having enlarged portions providing a support for said envelope of reduced area, and shock absorbing material occupying the clearance space within said envelope.

3. A new article of manufacture consisting of a permanent magnet in the form of a rod and an envelope enclosing said rod, said envelope having projecting outer portions adjacent its ends, and shock absorbing pads interposed between the ends of said rod and said envelope.

4. A new article of manufacture consisting of a permanent magnet in the form of a rod and an envelope enclosing said rod and having clearance therefrom both diametrically and longitudinally, packing interposed in said envelope in the clearance spaces diametrically of and at the ends of said rod, and outer projections on said envelope.

5. A new article of manufacture'consisting of a permanent magnet in the formof a rod and a glass envelope enclosing said rod and having clearance therefrom both diametrically and fabric interposed in said envelope between the rod and envelope, and shock absorbing pads interposed between the ends of said rod and said envelope, said envelope having enlarged outer portions adjacent the ends there- 6. A new article of manufacture consisting of a permanent magnet in the form of a rod and a glass envelope enclosing said rod and having clearance therefrom, and asbestos pads interposed between the ends of said rod and said envelope.

7 A new article of manufacture consisting of a permanent magnet in the form of a rod and a glass envelope enclosing said rod and having clearance therefrom both diametrically and longitudinally, a layer of fabric interposed in said envelope between the rod and envelope, and shock absorbing pads interposed between the ends of said rod and said envelope, said envelope having projecting outer portions adjacent the ends there- ISRAEL J. HAWTOF.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date D. 148,537 Harris Feb. 3, 1948 1,595,801 McDonald Aug. 10, 1926 

